Means for creating current impulses



Aug. 24, 1954 W. H. PETERSN MEANS FOR CREATING CURRENT IMPULSES Filed July 5, 1952 Fig! Fig#

fn Vrl for Patenfed Aug. 24, 1954 2,687,481

UNITED STATES PATENT (')FFICE 2,687,481 MEANS FOR CREATING CURRENT IMPULSES Wilhelm Henning Petersen, Vasteras, Sweden, assignor to Allninna Svenska Elektriska Aktiebolaget, Vasteras, Sweden, a corporation of Sweden Application July 5, 1952, Serial No. 297,378 Claims priority, application Sweden July 13, 1951 4 Claims. (Cl. 31o-15) It is known t Create rapid Current impulses for rection of rotation of the member 9 is made deigniting explosives and the like by displacing a pendent on its original position. In the position tiltable iron core in a coil in such manner with shown, the pressure member I2 strikes the ridge reference to a magnetic circuit generally con- II somewhat above its highest point and folteining a permanent magnet, that the direction lows the ridge down into the upper recess I0, of the flux through the coil is reversed. The whence it tends to rotate the member Ilv clockpresent invention relates to a device of this kind, Wise,

which has the advantage that all the reversals 0f Although in Fig. 2 all the parts serving the maflux through the coil are created by identical neuvering are for the sake of simplicity shown manual operation, and therefore there is no liV reason for causing any reversals to succeed each tice bent in a right angle, whereby it will be to a other immediately, as would be the case if every certain extent elastic and the instantaneous mosecond reversal were caused by a movement option of the armature thereby facilitated.

posite to the other ones. Impulses obtained ac- Figs. 3 and 4 show a modcation of the eleccording to the present invention are particularly l5 tromagnetic parts of the apparatus, in which the suitable for igniting the driving charge of rocket movable core is made from permanently magprojectiles. Other features of the invention will netic material, while the stationary parts of the be apparent from the following specification. magnetic circuit are made from soft iron. Such In the accompanying drawing there are shown, a form is more ecient than that of Figs. 1 and 2 in part diagrammatically, two forms of the inbut cannot always be used, as many alloys for vention, one of these in two sections perpendicupermanent magnets are so brittle that a core lar to each other in Figs. l and 2 and the other made therefrom runs the risk of being broken in corresponding views in Figs. 3 and 4. at the violent movements imparted thereto. Fig.

In Fig. 1, I designates a permanent magnet, to 3 shows the device in section as seen from the the ends of which there are secured two pieces end of the axis of rotation of the core, and Fig.

of soft iron, the upper of which for instance rep- 4 the same as seen from the end of the core. resents a north pole and is designated by N and In Figs. 3 and 4, I3 designates the stationary the lower a south pole and is designated by S. portion of the magnetic circuit, made from soft These pole pieces are shown in Fig. 2 as seen from iron, I4 the core forming a permanent magnet the right hand side of Fig. 1. They have both at l5 lts supporting pin and I6 the winding. In their ends projections N', N" and S', S facing the position shown of the core, if N designates each other. Between these projections, an armaits north pole, the ux will penetrate the coil ture 3 is movable around a pin 2 so as to bear from above, while in the other extreme position of either against N' and S or against S and N. the core it will pass from below. The return The armature cannot occupy any intermediate 3.3 ux will divide itself between the two sides of the position on account of the strong magnetic forces. sOft 11011 path In the Same Way as 1n Figs 1 and thereby a current impulse is induced in the latlo Iolaim as my invention:

The hole 5 in the armature 3 for the pin 2 iS prising a magnetic somewhat oblong in section, which has the adranged pole pieces of opposite vantage that there Will be a certain time interval member arranged between s between the separation of the armature from the Li: round pin mounted between pm 8, said projection engaging a recess `6 in one circuit and so arranged that the magnetic flux end of the armature. The member 9 has, on the penetrating Said e011 is r side opposed to the projection 'I, two recesses It cf said movable member separated by a ridge II which is influenced by a tion to the other, a pressure member for operatpressure member I 2 in such manner that the di- 55 ing said movable member, and a pivoted ridgeshaped member engaging said movable member, said pressure member operating said ridge-shaped member to move the movable member in one direction or the other depending on the position of said ridge-shaped member.

2. Means according to claim l, in which the movable member is a permanent magnet.

3. Electro-magnetic means for the creation of current impulses, comprising a magnetic circuit having opposed pole pieces of opposite polarity, a cross pin xed between said pole pieces, a movable member mounted on said pin for movement into engagement with pole pieces of opposite polarity, a coil surrounding a portion of said magnetic circuit and so arranged that the magnetic 15 flux penetrating said coil is reversedby displacement of said member from one extreme position to the other, means for so displacing said member as to reverse the magnetic flux, and an elongated hole through said member for the passage of said pin to permit transverse as Well as pivoting movement of the said member upon said pin to permit initial movement of one part of the member away from a pole piece Without simultaneous disengagement of another part of the member from a pole piece of opposite polarity.

4. Means according to claim 3, in which the movable member serves as a permanent magnet.

References Cited n the file of this patent UNITED STATES PATENTS Number Name Date 1,569,416 Bates Jan. 12, 1926 2,021,041 Altamura Nov. 12, 1935 2,376,557 Severance May 22, 1945 2,536,468 Russell Jan, 2, 1951 

